scholarly journals How Bovine Livestock Affects Seed Rain in Subtropical Climate Forest

2019 ◽  
Vol 11 (10) ◽  
pp. 240
Author(s):  
Maureen de Moraes Stefanello ◽  
Ana Paula Moreira Rovedder ◽  
Roselene Marostega Felker ◽  
Matheus Degrandi Gazzola ◽  
Betina Camargo ◽  
...  
Keyword(s):  
Diversity Index ◽  
Morphological Characteristics ◽  
Floristic Composition ◽  
Seed Rain ◽  
Subtropical Climate ◽  
Floristic Similarity ◽  
Management Regime ◽  
Pampa Biome ◽  
Forest Remnants ◽  
History Of

Seed rainfall may be one of the mechanisms most impacted by livestock production in forest remnants. The trampling and cattle grazing alter dynamics, structure and floristic composition of the forest. The present work characterized the seed rainin forest remnants and the possible impacts of the presence and the management regime with different cattle stocks in the Pampa biome, southern region of Brazil. We compared three areas in Seasonal Forest remnants with a management history of 43 years: cattle exclusion area (A1); area with a cattle stock of 0.5 ua ha-1 (A2); and area with cattle stock of 1.0 ua ha-1 (A3). The seed rain was collected quarterly in 16 collectors (1 × 1 m²) per area for 24 months. The seeds were counted and identified according to external morphological characteristics, habit and dispersion syndrome. Shannon diversity index, submitted to the Hutcheson test, Pielou evenness, expected diversity and floristic similarity were determined. The results indicated that the impacts caused by livestock to seed rain were more significant in A3 where a quantitative reduction in the number of seeds was observed, probably due to the low number of plant individuals that make up the community.

scholarly journals EVALUATION OF THE POTENTIAL OF SEED RAIN AS AN ALTERNATIVE FOR FOREST RESTORATION IN PERMANENT PRESERVATION AREAS1

2016 ◽  
Vol 40 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Emerson Pereira da Silva ◽  
Fabricio Gomes Figueiredo ◽  
Shaline Séfara Lopes Fernandes ◽  
Zefa Valdivina Pereira
Keyword(s):  
Forest Restoration ◽  
Diversity Index ◽  
Seed Rain ◽  
Forest Fragments ◽  
Monthly Basis ◽  
Mato Grosso ◽  
Evenness Index ◽  
Forest Remnants ◽  
Forested Areas ◽  
Mato Grosso Do Sul

ABSTRACT The ecological restoration of degraded areas using seeds collected in forest remnants has shown significant results. This study was developed to verify the potential of seed rain to regenerate forest fragments of a Permanent Preservation Area (PPA) in the Apa River Basin which is located in the southwestern portion of the Mato Grosso do Sul state, Brazil. To develop the study, we installed 25 collectors measuring 1 m2 each, which were systematically distributed on an area of 1.5ha. Seed gathering was conducted in a monthly basis throughout the year of 2013. A total of 26.411 propagules were identified and distributed among 50 species, 45 genera and 32 families. In terms of the propagules distribution, 70.51% were identified as trees, 22.8% as lianas, 6.5% as shrubs, 0.1 as herbaceous, 0.05% as palm and 0.05% could not be classified. The value for the Shannon Diversity Index was (H') = 1.67 and the Pielou Evenness index was (J) = 0.42. These results indicate that the seeds rain has low species diversity with the abundance of a few species. The overall results suggest that seed rain can be a potential technique for restoration of the PPAs and other forested areas. However, it is necessary to enhance the diversity of tree species.

scholarly journals Tree species richness and composition in a fragmented landscape of the Brazilian lowland Atlantic Forest

Rodriguésia ◽  
2020 ◽  
Vol 71 ◽  
Author(s):  
Solange de Vasconcellos Albuquerque Pessoa ◽  
Dorothy Sue Dunn de Araujo
Keyword(s):  
Tropical Forests ◽  
Biological Diversity ◽  
Floristic Composition ◽  
Southeastern Brazil ◽  
Fragmented Landscape ◽  
Floristic Similarity ◽  
Forest Diversity ◽  
Tree Layer ◽  
Α Diversity ◽  
Forest Remnants

Abstract Tropical forests are one of the most important ecosystems and loss of biological diversity in these is a major concern. We studied seven forest remnants on the coast of Rio de Janeiro, southeastern Brazil, three medium-sized (24-63 ha) and four small (5-11 ha), to assess the influence of size, degree of disturbance and isolation on composition and diversity of the tree layer. A total of 443 species in 60 families and 185 genera were recorded, with Myrtaceae, Lauraceae and Fabaceae being the most species-rich families. The results showed areas of high α-diversity (α= 34.86-75.69) and a slightly greater decline of similarity with distance between the study areas. Remnant size not explained the variation in the species composition and we found correlation between the level of disturbance and the floristic composition. The remnants had low floristic similarity, strongly influenced by the degree of disturbance. Results suggest that disturbance influences composition and diversity and confirm the importance of including both medium-sized and small remnants in the conservation of tropical forest diversity.

scholarly journals IMPACT OF Bambusa tuldoides MUNRO (POACEAE) ON FOREST REGENERATION

CERNE ◽  
2017 ◽  
Vol 23 (2) ◽  
pp. 275-282 ◽  
Author(s):  
Roselene Marostega Felker ◽  
Ana Paula Moreira Rovedder ◽  
Solon Jonas Longhi ◽  
Elias Frank Araujo ◽  
Maureen De Moraes Stefanello ◽  
...  
Keyword(s):  
Natural Regeneration ◽  
Diversity Index ◽  
Riparian Forest ◽  
Floristic Composition ◽  
Floristic Similarity ◽  
Key Species ◽  
High Dominance ◽  
And Cluster Analysis ◽  
South Of Brazil ◽  
The Impact

ABSTRACT Bamboo grove may cause changes in the structure and floristic composition of natural regeneration. This study evaluated the impact caused by Bambusa tuldoides Munro at natural regeneration, in riparian forest in Rio Grande do Sul, south of Brazil. Two areas were evaluated: riparian forest without bamboos (SB) as the reference area, and riparian forest dominated by Bambusa tuldoides (CB). In 2014, ten plots (10x10 m) were installed in each area. All individuals belonging to classes I (30≤ H <130 cm) and II (CBH≤5 cm) were measured and identified. Floristic composition, phytosociological indexes, Shannon diversity index, Margalef richness, Simpson dominance, Sorensen similarity, and cluster analysis by Twinspan were evaluated. Richness and absolute density decreased in CB compared to SB. The areas presented low floristic similarity, and high dominance of one or more species in both classes. Myrtaceae was the predominant botanic family in SB, especially Campomanesia xanthocarpa. In CB most species were secondary, as Myrsine umbellata, Cupania vernalis, and Ocotea puberula. Due to the large differences between SB and CB, the groups formed were restricted mostly to the species of each area. Species such as Myrsine umbellata (class I and II) and Strichnos brasiliensis (class II) appear as indicators and former of groups in CB. We concluded that high density of Bambusa tuldoides affect the richness and diversity of regeneration natural, changing the establishment and perpetuation of the species. Secondary species show greater potential for adaptation to these environments and can act as key species in management and recovery actions.

scholarly journals Floristic and structural status of forests in permanent preservation areas of Moju river basin, Amazon region

2016 ◽  
Vol 76 (4) ◽  
pp. 912-927 ◽  
Author(s):  
J. C. Oliveira ◽  
I. C. G. Vieira ◽  
A. S. Almeida ◽  
C. A. Silva Junior
Keyword(s):  
Multidimensional Scaling ◽  
River Basin ◽  
Diversity Index ◽  
Structural Characteristics ◽  
Floristic Composition ◽  
Forest Types ◽  
Floristic Similarity ◽  
Wiener Diversity Index ◽  
Floristic Patterns ◽  
Middle Strata

Abstract The goal of this study is to analyze the floristic patterns and the structure of disturbed and undisturbed upland forests, in Permanent Preservation Areas (PPAs) along the Moju river, in the Brazilian state of Pará. Trees with a diameter equal to or larger than 10cm at 1.30m from the ground (DBH) ≥10cm were analyzed for the upper stratum. For the middle stratum, individuals with DBH between 4.99 and 9.99cm were sampled. Forty-five families and 221 species were found in disturbed forests, and 43 families and 208 species in undisturbed forests. Floristic similarity was high between strata and between forest types, with values above 50%. Similarity was highest between middle strata. The most species-abundant families in undisturbed forests were Fabaceae, Sapotaceae, Chrysobalanaceae and Myrtaceae; the species with the highest density there were Eschweilera grandiflora, Licania sclerophylla and Zygia cauliflora. In disturbed forests, the dominant families were Fabaceae, Sapotaceae, Lecythidaceae and Melastomataceae. The Shannon-Wiener diversity index was 3.21 for undisturbed forests and 2.85 for disturbed forests. Non-metric multidimensional scaling (MDS) analysis did not group the forests by their floristic composition in both upper and middle strata. Overall, the PPA forests along the Moju river, even if disturbed, did not show major floristic changes but substantially change their structural characteristics.

scholarly journals STRUCTURE AND FLORISTIC COMPOSITION IN A DENSE OMBROPHILOUS FOREST AREA UNDER FOREST MANAGEMENT

FLORESTA ◽  
2019 ◽  
Vol 49 (4) ◽  
pp. 793
Author(s):  
Yasmim Andrade Ramos ◽  
Bruno Aurélio Campos Aguiar ◽  
Marcos Vinicius Cardoso Silva ◽  
Renata Elaine Siqueira Matos ◽  
Maria Cristina Bueno Coelho ◽  
...  
Keyword(s):  
Forest Management ◽  
Diversity Index ◽  
Floristic Composition ◽  
Timber Production ◽  
Floristic Diversity ◽  
Forest Fragment ◽  
Floristic Similarity ◽  
Breast Height ◽  
Ombrophilous Forest ◽  
Dense Ombrophilous Forest

This study shows the phytosociology and floristics of a Dense Ombrophilous Forest fragment under forest management in Portel city, Pará State. Six conglomerates were sampled, divided into secondary and tertiary plots totaling 120 sample units of 0.4 hectares each, in which all trees with diameter at breast height (130 cm above ground; DBH) above 10 cm were measured. These individuals were botanically identified, and evenness and floristic similarity were calculated. There were 3,586 individuals distributed in 42 families, 121 genera, and 174 species. Families Fabaceae, Lecythidaceae, and Sapotaceae were the ones that obtained the highest IVI and the highest representativity of individuals. Species Eschweilera coriacea (DC.) S.A.Mori, Vouacapoua americana Aubl., and Tetragastris altissima (Aubl.) Swart were the ones with the highest IVI. Among the ten highest results, we highlight Syzygiopsis oppositifolia Ducke and Manilkara dardanoi Ducke, with great potential for timber production. The Shannon diversity index averaged 3.83 between the plots, and the Pielou evenness averaged 0.84, showing that the area presents high floristic diversity and great potential for forest management activities.

scholarly journals Rubiaceae in Brazilian Atlantic Forest remnants: floristic similarity and implications for conservation

2016 ◽  
Vol 64 (2) ◽  
pp. 655 ◽  
Author(s):  
Alessandra Marques de Paiva
Keyword(s):  
Atlantic Forest ◽  
Rio De Janeiro ◽  
Urban Expansion ◽  
Floristic Composition ◽  
The State ◽  
Forest Community ◽  
Bootstrap Support ◽  
Floristic Similarity ◽  
Forest Remnants ◽  
Brazilian Flora

<p>The Atlantic Forest presents great biological complexity and high richness and endemism levels, but it is one of the most threatened phytogeographic domain on the planet. Brazil is one of the Rubiaceae diversity centers in the Neotropics. The relevance and representativeness of the Rubiaceae family in the Atlantic Forest is highlighted in floristic composition studies and tropical forest community structures. However, despite the urban expansion in the state of Rio de Janeiro, we still find large areas of continuous vegetation with high connectivity degree. Recently, Rubiaceae flora and floristic surveys were conducted in <em>Restinga</em> and forest areas of Rio de Janeiro state protected by Conservation Units. New Rubiaceae species also have been described in the fluminense flora and they showed localized distributions and small populations. The current paper analyzes the floristic composition of the Rubiaceae in eight Atlantic Forest remnants in the State of Rio de Janeiro - Área de Proteção Ambiental de Grumari, Área de Proteção Ambiental Palmares, Parque Estadual da Serra da Tiririca, Parque Nacional do Itatiaia, Parque Nacional de Jurubatiba, Reserva Biológica de Poço das Antas, Reserva Biológica do Tinguá e Reserva Ecológica de Macaé de Cima - using the PAST software ("<em>Paleontological Statistics</em>") with Sørensen coefficient. Low similarity levels were found due to the habitats’ heterogeneity. <em>Restinga</em> and forest remnants formed distinct groups. The dendrogram showed the formation of three groups, but only Área de Proteção Ambiental de Grumari and Parque Nacional de Jurubatiba (<em>Restinga</em> areas) showed strong bootstrap support (98%). The current study pointed out 19 micro endemic species from the Atlantic Forest, thus conservation strategies were herein discussed. Discrepancies between the Catalogue of Flora of Rio de Janeiro and the Red Book of Brazilian Flora (two of the main reference catalogs of Brazilian flora) have been identified. We also highlight the need for recollecting microendemic species from the Atlantic Forest. We have suggested developing the Red Book of Endangered Species Plant of the State of Rio de Janeiro and launching research projects based on the phylogeographic approach and on conservation biology to faster broadcast information about species that face restricted distribution in the Atlantic Forest.</p>

scholarly journals Floristic and structural comparisons between woody communities of two seasonal forest fragments in the Tocantins river basin and other remnants of this forest physiognomy in Brazil

Rodriguésia ◽  
2014 ◽  
Vol 65 (1) ◽  
pp. 21-33 ◽  
Author(s):  
Marcelo Brilhante de Medeiros ◽  
Bruno Machado Teles Walter ◽  
Washington Luis Oliveira
Keyword(s):  
River Basin ◽  
Floristic Composition ◽  
Ground Level ◽  
Distinct Pattern ◽  
Forest Fragments ◽  
Floristic Similarity ◽  
Composition And Structure ◽  
Forest Remnants ◽  
Tocantins River ◽  
Seasonal Forests

This work describes the woody layer composition and structure in two seasonal forest fragments in the Tocantins river basin and compares them to other remnants of this forest physiognomy in Brazil. The survey was carried out by using 17 plot samples (20 × 50 m) located in Palmeirópolis, state of Tocantins, and in Minaçú, state of Goiás. All woody individuals showing diameters > 5 cm, at 1.30 cm above ground level, were recorded. The higher floristic similarity of these forest remnants compared with other closer seasonal forests did not show a distinct pattern. The floristic composition was more similar to that of a deciduous seasonal forest in the Paranã valley, and more dissimilar to other forests in this same valley. This result and a higher dissimilarity related to the southern forests in Goiás suggest that the forest fragments showed a floristic composition and structure typical of lowland seasonal forests in the Tocantins river basin. The results also indicated that the forest fragments have distinct floristic compositions with a relatively similar structure and diversity.

Diversity metrics, species turnovers and nestedness of bird assemblages in a deep karst sinkhole

2017 ◽  
Vol 63 (2) ◽  
pp. 8-16 ◽  
Author(s):  
Corrado Battisti ◽  
Marco Giardini ◽  
Francesca Marini ◽  
Lorena Di Rocco ◽  
Giuseppe Dodaro ◽  
...  
Keyword(s):  
Species Richness ◽  
Random Distribution ◽  
Diversity Index ◽  
Species Turnover ◽  
Floristic Composition ◽  
Bird Assemblages ◽  
Β Diversity ◽  
Stick Model ◽  
Karst Sinkhole

We reported a study on breeding birds occurring inside an 80 m-deep karst sinkhole, with the characterization of the assemblages recorded along its semi-vertical slopes from the upper edge until the bottom. The internal sides of the sinkhole have been vertically subdivided in four belts about 20 m high. The highest belt (at the upper edge of the cenote) showed the highest values in mean number of bird detections, mean and normalized species richness, and Shannon diversity index. The averaged values of number of detections and species richness significantly differ among belts. Species turnover (Cody’s β-diversity) was maximum between the highest belts. Whittaker plots showed a marked difference among assemblages shaping from broken-stick model to geometric series, and explicited a spatial progressive stress with a disruption in evenness towards the deepest belts. Bird assemblages evidenced a nested subset structure with deeper belts containing successive subsets of the species occurring in the upper belts. We hypothesize that, at least during the daytime in breeding season, the observed non-random distribution of species along the vertical stratification is likely due to (i) the progressive simplification both of the floristic composition and vegetation structure, and (ii) the paucity of sunlight as resources from the upper edge to the inner side of the cenote.

scholarly journals Floristic composition of the Montane Forest in the Almadina-Barro Preto axis, Southern Bahia, Brazil

2014 ◽  
Vol 14 (1) ◽  
Author(s):  
Macielle Macedo Coelho ◽  
André Márcio Amorim
Keyword(s):  
Species Richness ◽  
Tropical Forests ◽  
Atlantic Forest ◽  
Floristic Composition ◽  
Woody Species ◽  
Life Forms ◽  
Montane Forest ◽  
Forest Remnants ◽  
Southern Bahia ◽  
Arboreal Habit

The aim of this study is to survey the angiosperms of two montane forest remnants in the southern Bahia, Brazil: Corcovado (SCO) and Pedra Lascada (SPL). Both fragments are located in the municipality of Almadina and Barro Preto, respectively, and are 18 km distant from each other. We sampled 899 species of angiosperms distributed in 437 genera and 116 families. The SCO was the richest area with 678 species, distributed in 367 genera and 100 families. SPL showed 466 species in 269 genera and 88 families. The percentage of species identified was 85.8% and of this total, 37.7% are endemic to the Atlantic Forest, 11.2% are endemic to southern Bahia and northern Espírito Santo and 7% are disjunct between the Atlantic Forest and Amazon. The remaining percentages (44.3%) were of species widely distributed. The richest families in the two areas were Orchidaceae (10%), Rubiaceae (7%), Bromeliaceae (5.5%), Melastomataceae (4.2%) and Poaceae (4%). The richest genera were Psychotria (2%),Piper (1.8%), Ocotea (1.6%),Vriesea (1.5%) and Peperomia (1.4%). More than half of the recorded species showed non-arboreal habit, regarding life forms documented. That comes against the assertion that many authors in the tropical forests, where species richness in angiosperms is expected for non-woody species, especially in montane forests. Twelve species have been identified as new, but seven others already described from collections previously obtained in these two areas. Orchidaceae, Rubiaceae, Poaceae and Bromeliaceae showed significant richness in this study these families are commonly reported as the richest in other inventories in the Atlantic Forest in southern Bahia reinforcing their importance to the regional flora. The high levels of richness, endemism, and the growing numbers of new taxonomic discoveries from the SPL and SCO sites indicate the biological importance of these two forest remnants. The implementation of parks or other protected environmental reserves would be essential to the conservation of its species.

scholarly journals Short-term community dynamics in seasonal and hyperseasonal cerrados

2009 ◽  
Vol 69 (2) ◽  
pp. 231-240 ◽  
Author(s):  
MV. Cianciaruso ◽  
MA. Batalha
Keyword(s):  
Rainy Season ◽  
Community Dynamics ◽  
Plant Density ◽  
Floristic Composition ◽  
Species Density ◽  
Environmental Filters ◽  
Floristic Similarity ◽  
Different Seasons ◽  
Cylindrical Volume ◽  
Vegetation Form

In South America, the largest seasonal savanna region is the Brazilian cerrado. Our aim was to study temporal changes in some community descriptors, such as floristic composition, richness, species density, plant density, and cylindrical volume, in a seasonal cerrado, comparing it to a nearby hyperseasonal cerrado. In four different seasons, we placed randomly ten 1 m² quadrats in each vegetation form and sampled all the vascular plants. Seasonal changes in floristic composition, species density, and plant density were less pronounced in the seasonal than in the hyperseasonal cerrado. Floristic similarity between the vegetation forms was lower when the hyperseasonal cerrado was waterlogged. Richness and species density were higher in the seasonal cerrado, which reached its biomass peak at mid rainy season. The hyperseasonal cerrado, in turn, reached its biomass peak at early rainy season and, despite the waterlogging, maintained it until late rainy season. In the hyperseasonal cerrado, waterlogging acts as an environmental filter restricting the number of cerrado species able to withstand it. The seasonal cerrado community was more stable than the hyperseasonal one. Our results corroborated the idea that changes in the environmental filters will affect floristic composition and community structure in savannas.

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